Pregnancy Calendar Detailed explanation of how to check your due date Pregnancy is a crucial stage in every woman\’s life. The due date is one of the most important time points during pregnancy. How to check the expected date of delivery? This requires the use of a pregnancy calendar. The pregnancy calendar is a very convenient method that can help pregnant women directly calculate the due date and at the same time calculate the fetal growth at different gestational weeks based on the pregnancy cycle. The following will give you a detailed introduction to the pregnancy calendar method to check the due date. Step 1: Calculate ovulation day. The pregnancy calendar contains information such as \”Start date of last menstrual period\” and \”Menstrual cycle length\”.